lsprof: remove __main__ functionality
I'm pretty sure nobody uses this. I noticed it because Python 3
linting is complaining about execfile.
Differential Revision: https://phab.mercurial-scm.org/D7017
[tool.black]
line-length = 80
exclude = 'build/|wheelhouse/|dist/|packages/|\.hg/|\.mypy_cache/|\.venv/|mercurial/thirdparty/|hgext/fsmonitor/pywatchman/|contrib/python-zstandard/'